I'm 26 and don't do no drugs why do I have a bald spot?

?alopecia areata. A single bald spot on the head or scalp, may indicate an autoimmune disorder called alopecia areata, or sometimes it could be due to a fungal infection, or other infectious causes. See a dermatologist. These are not usually related to illicit drug use.
Doctor can evaluate. If it is not alopecia arreata or a fungal problem; "pattern baldness" is a common cause of hair loss, and is usually inherited (it's in the genes). In men, it is called male pattern baldness or androgenic alopecia. Men get a receding hair line and hair loss on top of the head. In women, it is called female pattern baldness. Women get some hair loss from the whole scalp, so the hair looks thinner.